515412 ÷ 30 
Let's see how many times 30 fits into 515412.

Moving on to step 1:
The number 30 fits into 5 0 times, leaving a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Take the next digit (1) from the dividend and append it to 5, then repeat: 51 / 30

Going ahead to step 2:
51 divided by 30 is 1 with a remainder of 21.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtract 30 from 51 to get 21.
Fetch the next digit (5) from the dividend, attach it to 21 and continue: 215 / 30

Moving on to step 3:
The number 30 fits into 215 7 times, leaving a remainder of 5.
The next digit of our result is 7. 
Result so far: 17.0
If we subtract 210 from 215, we get 5.
Append the next digit (4) from the dividend to 5 and continue with: 54 / 30

On to step 4:
If we divide 54 by 30, we get 1 and a remainder of 24.
Record the quotient 1 as the next digit in the result. 
Result so far: 171.0
If we subtract 30 from 54, we get 24.
Include the next digit (1) from the dividend after 24, then repeat: 241 / 30

Going ahead to step 5:
When dividing 241 by 30, we get 8 with a remainder of 1.
The next digit of our result is 8. 
Result so far: 1718.0
If we subtract 240 from 241, we get 1.
Bring next digit (2) of the dividend behind the 1 and repeat the process: 12 / 30

Step 6:
If we divide 12 by 30, we get 0 and a remainder of 12.
Record the quotient 0 as the next digit in the result. 
Result so far: 17180.0
If we take 0 away from 12, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 7:
120 divided by 30 is 4 with a remainder of 0.
Record the quotient 4 as the next digit in the result. 
Result so far: 17180.4
If we subtract 120 from 120, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 8:
30 goes into 0 0 times with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 17180.4
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 9:
When dividing 0 by 30, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 17180.4
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Our division results in 17180.4 with a remaining 0.0.